Documentation/ABI/testing/sysfs-fs-f2fs

   1 What:           /sys/fs/f2fs/<disk>/gc_max_sleep_time
   2 Date:           July 2013
   3 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
   4 Description:
   5                  Controls the maximun sleep time for gc_thread. Time
   6                  is in milliseconds.
   7
   8 What:           /sys/fs/f2fs/<disk>/gc_min_sleep_time
   9 Date:           July 2013
  10 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
  11 Description:
  12                  Controls the minimum sleep time for gc_thread. Time
  13                  is in milliseconds.
  14
  15 What:           /sys/fs/f2fs/<disk>/gc_no_gc_sleep_time
  16 Date:           July 2013
  17 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
  18 Description:
  19                  Controls the default sleep time for gc_thread. Time
  20                  is in milliseconds.
  21
  22 What:           /sys/fs/f2fs/<disk>/gc_idle
  23 Date:           July 2013
  24 Contact:        "Namjae Jeon" <namjae.jeon@samsung.com>
  25 Description:
  26                  Controls the victim selection policy for garbage collection.
  27
  28 What:           /sys/fs/f2fs/<disk>/reclaim_segments
  29 Date:           October 2013
  30 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  31 Description:
  32                  Controls the issue rate of segment discard commands.
  33
  34 What:           /sys/fs/f2fs/<disk>/ipu_policy
  35 Date:           November 2013
  36 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  37 Description:
  38                  Controls the in-place-update policy.
  39
  40 What:           /sys/fs/f2fs/<disk>/min_ipu_util
  41 Date:           November 2013
  42 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  43 Description:
  44                  Controls the FS utilization condition for the in-place-update
  45                  policies.
  46
  47 What:           /sys/fs/f2fs/<disk>/min_fsync_blocks
  48 Date:           September 2014
  49 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  50 Description:
  51                  Controls the dirty page count condition for the in-place-update
  52                  policies.
  53
  54 What:           /sys/fs/f2fs/<disk>/min_seq_blocks
  55 Date:           August 2018
  56 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  57 Description:
  58                  Controls the dirty page count condition for batched sequential
  59                  writes in ->writepages.
  60
  61
  62 What:           /sys/fs/f2fs/<disk>/min_hot_blocks
  63 Date:           March 2017
  64 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
  65 Description:
  66                  Controls the dirty page count condition for redefining hot data.
  67
  68 What:           /sys/fs/f2fs/<disk>/min_ssr_sections
  69 Date:           October 2017
  70 Contact:        "Chao Yu" <yuchao0@huawei.com>
  71 Description:
  72                  Controls the fee section threshold to trigger SSR allocation.
  73
  74 What:           /sys/fs/f2fs/<disk>/max_small_discards
  75 Date:           November 2013
  76 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  77 Description:
  78                  Controls the issue rate of small discard commands.
  79
  80 What:          /sys/fs/f2fs/<disk>/discard_granularity
  81 Date:          July 2017
  82 Contact:       "Chao Yu" <yuchao0@huawei.com>
  83 Description:
  84                 Controls discard granularity of inner discard thread, inner thread
  85                 will not issue discards with size that is smaller than granularity.
  86                 The unit size is one block, now only support configuring in range
  87                 of [1, 512].
  88
  89 What:           /sys/fs/f2fs/<disk>/max_victim_search
  90 Date:           January 2014
  91 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  92 Description:
  93                  Controls the number of trials to find a victim segment.
  94
  95 What:           /sys/fs/f2fs/<disk>/dir_level
  96 Date:           March 2014
  97 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
  98 Description:
  99                  Controls the directory level for large directory.
 100
 101 What:           /sys/fs/f2fs/<disk>/ram_thresh
 102 Date:           March 2014
 103 Contact:        "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
 104 Description:
 105                  Controls the memory footprint used by f2fs.
 106
 107 What:           /sys/fs/f2fs/<disk>/batched_trim_sections
 108 Date:           February 2015
 109 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 110 Description:
 111                  Controls the trimming rate in batch mode.
 112                  <deprecated>
 113
 114 What:           /sys/fs/f2fs/<disk>/cp_interval
 115 Date:           October 2015
 116 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 117 Description:
 118                  Controls the checkpoint timing.
 119
 120 What:           /sys/fs/f2fs/<disk>/idle_interval
 121 Date:           January 2016
 122 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 123 Description:
 124                  Controls the idle timing.
 125
 126 What:           /sys/fs/f2fs/<disk>/iostat_enable
 127 Date:           August 2017
 128 Contact:        "Chao Yu" <yuchao0@huawei.com>
 129 Description:
 130                  Controls to enable/disable IO stat.
 131
 132 What:           /sys/fs/f2fs/<disk>/ra_nid_pages
 133 Date:           October 2015
 134 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 135 Description:
 136                  Controls the count of nid pages to be readaheaded.
 137
 138 What:           /sys/fs/f2fs/<disk>/dirty_nats_ratio
 139 Date:           January 2016
 140 Contact:        "Chao Yu" <chao2.yu@samsung.com>
 141 Description:
 142                  Controls dirty nat entries ratio threshold, if current
 143                  ratio exceeds configured threshold, checkpoint will
 144                  be triggered for flushing dirty nat entries.
 145
 146 What:           /sys/fs/f2fs/<disk>/lifetime_write_kbytes
 147 Date:           January 2016
 148 Contact:        "Shuoran Liu" <liushuoran@huawei.com>
 149 Description:
 150                  Shows total written kbytes issued to disk.
 151
 152 What:           /sys/fs/f2fs/<disk>/features
 153 Date:           July 2017
 154 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 155 Description:
 156                  Shows all enabled features in current device.
 157
 158 What:           /sys/fs/f2fs/<disk>/inject_rate
 159 Date:           May 2016
 160 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 161 Description:
 162                  Controls the injection rate.
 163
 164 What:           /sys/fs/f2fs/<disk>/inject_type
 165 Date:           May 2016
 166 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 167 Description:
 168                  Controls the injection type.
 169
 170 What:           /sys/fs/f2fs/<disk>/reserved_blocks
 171 Date:           June 2017
 172 Contact:        "Chao Yu" <yuchao0@huawei.com>
 173 Description:
 174                  Controls target reserved blocks in system, the threshold
 175                  is soft, it could exceed current available user space.
 176
 177 What:           /sys/fs/f2fs/<disk>/current_reserved_blocks
 178 Date:           October 2017
 179 Contact:        "Yunlong Song" <yunlong.song@huawei.com>
 180 Contact:        "Chao Yu" <yuchao0@huawei.com>
 181 Description:
 182                  Shows current reserved blocks in system, it may be temporarily
 183                  smaller than target_reserved_blocks, but will gradually
 184                  increase to target_reserved_blocks when more free blocks are
 185                  freed by user later.
 186
 187 What:           /sys/fs/f2fs/<disk>/gc_urgent
 188 Date:           August 2017
 189 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 190 Description:
 191                  Do background GC agressively
 192
 193 What:           /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
 194 Date:           August 2017
 195 Contact:        "Jaegeuk Kim" <jaegeuk@kernel.org>
 196 Description:
 197                  Controls sleep time of GC urgent mode
 198
 199 What:           /sys/fs/f2fs/<disk>/readdir_ra
 200 Date:           November 2017
 201 Contact:        "Sheng Yong" <shengyong1@huawei.com>
 202 Description:
 203                  Controls readahead inode block in readdir.
 204
 205 What:           /sys/fs/f2fs/<disk>/extension_list
 206 Date:           Feburary 2018
 207 Contact:        "Chao Yu" <yuchao0@huawei.com>
 208 Description:
 209                  Used to control configure extension list:
 210                  - Query: cat /sys/fs/f2fs/<disk>/extension_list
 211                  - Add: echo '[h/c]extension' > /sys/fs/f2fs/<disk>/extension_list
 212                  - Del: echo '[h/c]!extension' > /sys/fs/f2fs/<disk>/extension_list
 213                  - [h] means add/del hot file extension
 214                  - [c] means add/del cold file extension